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General improvements (text and features)

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* Added clear_atlas_region_caches & clear_shape_cache to VEFontCache (Usage Example: On hot-reloads to force refresh the caches if tuning the library)
* Made glyph_draw's over_sample a vec2 for initialization (incase user wants to do some float value multiple of 4x4)
* ADVANCE_SNAP_SMALLFONT_SIZE made a runtime option: Shaper_Context.adv_snap_small_font_threshold
* Some improvement to text hinting and general rendering of text
* Better defaults for initialization of the library
This commit is contained in:
Edward R. Gonzalez
2024-12-29 18:27:46 -05:00
parent 55a4c3dee6
commit 90ca01bdaa
8 changed files with 177 additions and 91 deletions
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39
vefontcache/shaper.odin
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@@ -13,6 +13,9 @@ Shaper_Kind :: enum {
Shaper_Context :: struct {
hb_buffer : harfbuzz.Buffer,
snap_glyph_position : b32,
adv_snap_small_font_threshold : f32,
}
Shaper_Info :: struct {
@@ -66,12 +69,13 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
max_line_width := f32(0)
line_count := 1
line_height := (ascent - descent + line_gap) * size_scale
line_height := ((ascent - descent + line_gap) * size_scale)
position, vertical_position : f32
shape_run :: proc( buffer : harfbuzz.Buffer, script : harfbuzz.Script, font : harfbuzz.Font, output : ^Shaped_Text,
position, vertical_position, max_line_width: ^f32, line_count: ^int,
ascent, descent, line_gap, size, size_scale: f32 )
ascent, descent, line_gap, size, size_scale: f32,
snap_shape_pos : b32, adv_snap_small_font_threshold : f32 )
{
// Set script and direction. We use the system's default langauge.
// script = HB_SCRIPT_LATIN
@@ -101,24 +105,29 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
(max_line_width^) = max( max_line_width^, position^ )
(position^) = 0.0
(vertical_position^) -= line_height
(vertical_position^) = cast(f32) i32(vertical_position^ + 0.5)
(vertical_position^) = floor(vertical_position^ + 0.5)
(line_count^) += 1
continue
}
if abs( size ) <= ADVANCE_SNAP_SMALLFONT_SIZE
if abs( size ) <= adv_snap_small_font_threshold
{
(position^) = ceil( position^ )
}
append( & output.glyphs, glyph_id )
pos := position^
pos := position^
v_pos := vertical_position^
offset_x := f32(hb_gposition.x_offset) * size_scale
offset_y := f32(hb_gposition.y_offset) * size_scale
append( & output.positions, Vec2 { cast(f32) i32( pos + offset_x + 0.5 ),
v_pos + offset_y,
})
pos += offset_x
v_pos += offset_y
if snap_shape_pos {
pos = ceil(pos)
v_pos = ceil(v_pos)
}
append( & output.positions, Vec2 {pos, v_pos})
(position^) += f32(hb_gposition.x_advance) * size_scale
(vertical_position^) += f32(hb_gposition.y_advance) * size_scale
@@ -151,13 +160,23 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
}
// End current run since we've encountered a script change.
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale )
shape_run(
ctx.hb_buffer, current_script, info.font, output,
& position, & vertical_position, & max_line_width, & line_count,
ascent, descent, line_gap, size, size_scale,
ctx.snap_glyph_position, ctx.adv_snap_small_font_threshold
)
harfbuzz.buffer_add( ctx.hb_buffer, hb_codepoint, codepoint == '\n' ? 1 : 0 )
current_script = script
}
// End the last run if needed
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale )
shape_run(
ctx.hb_buffer, current_script, info.font, output,
& position, & vertical_position, & max_line_width, & line_count,
ascent, descent, line_gap, size, size_scale,
ctx.snap_glyph_position, ctx.adv_snap_small_font_threshold
)
// Set the final size
output.size.x = max_line_width